fix(rust,python): incorrect is_first_distinct for boolean arrays of length >= 64
#11527
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nameexhaustion
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ritchie46,
stinodego,
alexander-beedie and
orlp
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fixes #11530
is_first_distinctgoes through a fast path for boolean arrays whose lengths are >=64, and it currently calculates index offsets from the wrong side (leading bits instead of trailing bits).